After a short period of maintanance, the STEEM and Steem Dollars (SBD) markets on the crypto exchange Bittrex.com are now back in full operation, so you can deposit and withdraw tokens from and to the exchange.
It seems that there is a slight spike in the price of Steem Dollars at the moment, while at the same time the price of STEEM is dropping a bit, but then again everything can reverse at any time. So if you are interested in purchasing STEEM it might be the right time to do it from Bittrex than from Poloniex where the rate is higher and you will have to pay more, on the other hand selling at Poloniex is the better choice.
Larger differences in price between the exchange rates for STEEM and Steem Dollars (SBD) between Bittrex and Poloniex also create arbitrage opportunity to trade with profit between the two exchanges. The fast transaction speeds of both tokens make it easy to take action and catch a quick uptrend or downtrend in prices...